Pc turns and off every few secs, any ideas

ok i have a computer and i built it so maybe i did something wrong. but as soon as i hit the power switch on the back of the power supply the pc turns on all fans and stuff start up then about 6 secs latter it turns off, then 6 secs latter back on and keeps doing this untill i plug the power supply.....

specs

Case= RAIDMAX SMILODON ATX-612WBP Black 1.0mm SECC Steel ATX Mid Tower Foldout MB Computer Case
mother board = Intel DP55KG Extreme Series Desktop Motherboard (P55 ATX Core i7 Core i5 LGA1156)
Graphics Card =EVGA nVidia GeForce GTS 250 1 GB DDR3 2DVI/HDTV PCI-Express Video Card 01G-P3-1158-TR
Memory = Samsung MV-3V2G4 2GB DDR3 SDRAM Desktop Memory Module (1333MHz PC3-10600) 6gb have 6 gb total
DVD DRIVE = Lite-On LightScribe 24X SATA DVD+/-RW Dual Layer Drive IHAS424-98 - Retail (Black)
MediaCard reader = Dynex Media Card Reader
Power Supply = ROCKETFISH GAMING CPU POWER SUPPLY 500W RF-500WPS2
CPU = Intel Core i3 Processor i3-540 3.06GHz 4MB LGA1156 CPU BX80616I3540
Hard Drive = 500gb 3.5" desktop sata hard drive wd5000aaks
cpu cooler = Genuine Intel COPPER Base Core i3 530 540 550 560 CPU Heatsink Fan socket 1156

so i should go buy a new power supply and that should work???

Monster212 said:

so i should go buy a new power supply and that should work???

Or maybe your fans aren't working (specifically the CPU cooler) and the machine is shutting down for thermal protection because the temperature is rising rapidly over some extreme point.

Of course that wouldn't really explain why it would spontaneously then power itself back on 6 seconds later. This is the curious part of the story. I would have thought "power off" (for whatever reason) is permanent.

Does the BIOS on your motherboard have some fan/noise settings, which because of where they're set (for reduced noise) possibly have the fans running at too low a speed to cool the machine? I wouldn't think this could cause the exceeding of a critical temperature limit within 6 seconds, but I'm just asking.

Certainly an interesting story.

i cant even get into bios does not let me on log enough and nothing shows on my screen.... maybe a bad graphics card????

If it's shutting off/turning on that quick & you just built it, I'd suspect a short, probably under the motherboard.
I'd check that all the standoffs are in the right position & there isn't one out of place making contact with the motherboard.

Jim

No beep codes from the BIOS? Often the hardware tries to communicate to you if it is operational and can at least detect a recognizable hardware problem, with the beep pattern codes documented in the "troubleshooting" section of the manual, or on the manufacturer's web site or through their support phone. But if you're not even getting that, forget that idea.

Did you describe your memory as 3 sticks of identical 2GB = 6GB?

Can you disconnect all of the non-critical peripheral components (e.g. DVD drive and SATA hard drive and USB-internal (presumably) card reader, and even video card) and just have the CPU and memory installed. Then see what happens, Pull both power cables and data cables from them, and remove the video card. See if that makes any difference in what happens at boot time.

I'd certainly expect a beep code indicating no video, but the question is does the machine stay on long enough to communicate this beep code or does it still power itself off in 6 seconds.

NVidia says that card uses a maximum of 150 watts. They recommend a 450 watt power supply, if you decide you need a new one. That Rocketfish you have may have gone south.

i am going to try another power supply and see if thats it.... also i will unhook everything and just have the cpu and see what happens... and no beep code at all...